I have been working on a new civ for about three days now. I have gotten everything correct. Their arn't any XML errors whatsoever, and my civ is working. However, the only thing is wrong is that I can't build my UU or UB in a city w/ my civ! The UU is a replacment for the swordsman and I have all tech/resource requirements, and the UB is a barracks replacement, which you are supposed to be able to build at the very beginning. However, they don't show up as an option for building. However, they do show up in the world builder, and I can spawn the unit and the building without any trouble. What's up?!?

Also, I have noticed in the civilopedia entry that the UU and the UB don't show up under the civ, however, they show up in the Units and Buildings section of the civilopedia. Also, they say "replaces the swordsman", but it dosn't say, "Unique unit for my civ". It's kind of weird.
Is something important missing? I'm guessing that is the case. I really badly want to use my civ in a game. Its fictious, but really cool. The UU gets a MAJOR BONUS vs. Archery Units, and gets a 20% city attack bonus right off the bat!

Also, the UB gets a 2+ happiness and health bonus, and gives 5 xp instead of 3 xp.
Its really cool sounding, but I can't play the civ w/ out making the UU or UB!!!
Also, the building that the UU and UB are replacing also don't show up. So, I can't build the UB or a barracks and I can't build the UU or the swordsman. They just don't show up as options!!!

This is my UU (It actually is a spearman replacing a swordsman) in my game:

Its pretty awesome!

Also, I noticed that instead of the name "Murmillo" or "Stronghold", the names for the UU and UB that show up in the civilopedia and in worldbuilder are just "Swordsman" and "Barracks".
-Martimus
P.S.
civlearner99, I have an answer to your question...
I have read on multiple mods about modding/tutorials. And every time I get the same answer. "At the moment, nobody is able to create new 3d leaderheads." You can't make a whole new one altogether. However, you can use pieces of the default leaderheads/skins that others have created to make a new looking leader head. I know that dosn't help a whole lot, but it partially answers your question.
Good luck with the rest!
